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Muscle strength and mobility in vitamin D-insufficient female geriatric patients: a randomized controlled trial on vitamin D and calcium supplementation

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Abstract

Background and aims: Insufficient vitamin D status, commonly found in older people, has been associated with muscle weakness which, in old age, impairs mobility and is a risk factor for falling. In a randomized, double-blind placebo-controlled trial, we tested the hypothesis that vitamin D + calcium supplementation improves muscle strength and mobility, compared with calcium mono-therapy in vitamin D-insufficient female geriatric patients. Methods: Seventy female geriatric patients >65 years of age with serum 25-hydroxyvitamin D3 (25OHD) concentrations between 20 and 50 nmol/L, visiting an outpatient geriatric department, were included. Participants received either cholecalciferol 400 IU/day + calcium 500 mg/day (D/Cal group) or a placebo + calcium 500 mg/day (Plac/Cal group) for 6 months. At baseline and 6 months, muscle strength, power and functional mobility were tested. Results: At baseline, 25OHD was significantly (p<0.05) associated with knee extension strength (r=0.42), handgrip strength (r=0.28), leg extension power (r=0.34), Timed Get Up and Go (r=−0.31) and Modified Cooper test (r=0.44). At 6 months, a significant difference in 25OHD (77.2 vs 41.6 nmol/L, p<0.001) and 1,25OHD was found between the two groups. Significantly improving vitamin D status in the D/Cal group compared with the Plac/Cal group did not result in a significant difference in strength or functional mobility between the two groups. Conclusions: Daily 400IU vitamin D + 500 mg calcium supplementation is not enough to significantly improve strength or mobility in vitamin D-insufficient female geriatric patients.

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Correspondence to Hennie C. J. P. Janssen MD.

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Janssen, H.C.J.P., Samson, M.M. & Verhaar, H.J.J. Muscle strength and mobility in vitamin D-insufficient female geriatric patients: a randomized controlled trial on vitamin D and calcium supplementation. Aging Clin Exp Res 22, 78–84 (2010). https://doi.org/10.1007/BF03324819

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